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SAP NetWeaver AS ABAP 7.4 Directory Traversal Vulnerability
Application: SAP NetWeaver AS ABAP Versions Affected: SAP NetWeaver AS ABAP 7.4 Vendor URL: http://SAP.com Bugs: Directory traversal Sent: 22.04.2016 Reported: 23.04.2016 Vendor response: 23.04.2016 Date of Public Advisory: 09.08.2016 Reference: SAP Security Note 2312966 Author: Daria Prosochkina (ERPScan) Description 1. ADVISORY INFORMATION Title: [ERPSCAN-16-031] SAP NetWeaver AS ABAP a directory traversal using READ DATASET Advisory ID: [ERPSCAN-16-031] Risk: high Advisory URL: https://erpscan.com/advisories/erpscan-16-031-sap-netweaver-abap-directory-traversal-via-using-read-dataset/ Date published: 11.11.2016 Vendors contacted: SAP 2. VULNERABILITY INFORMATION Class: Directory traversal Impact: read file from system Remotely Exploitable: yes Locally Exploitable: yes CVSS Information CVSS Base Score v3: 4.3 / 10 CVSS Base Vector: AV : Attack Vector (Related exploit range) Network (N) AC : Attack Complexity (Required attack complexity) Low (L) PR : Privileges Required (Level of privileges needed to exploit) Low (L) UI : User Interaction (Required user participation) None (N) S : Scope (Change in scope due to impact caused to components beyond the vulnerable component) Unchanged (U) C : Impact to Confidentiality Low (L) I : Impact to Integrity None (N) A : Impact to Availability None (N) 3. VULNERABILITY DESCRIPTION The code provides access to the file specified after the READ DATASET statement. The variable transmitted to the input of the statement is entered in it by user input. Thus, the user can access the files stored on the operating system. This vulnerability is called a Directory Traversal. The attack is possible if the application does not check the user data and does not delete special characters used for a directory traversal attack from the variable, in which the filename is passed. As a result, an attacker can read data from all files, to which the application has access. To discover this vulnerability, data flow analysis and other unique techniques are used. 4. VULNERABLE PACKAGES SAP_ABA 700 SAP_ABA 701 SAP_ABA 702 SAP_ABA 710 SAP_ABA 711 SAP_ABA 730 SAP_ABA 731 SAP_ABA 740 SAP_ABA 750 SAP_ABA 751 SAP_ABA 75A SAP_ABA 75B 5. SOLUTIONS AND WORKAROUNDS To correct this vulnerability, install SAP Security Note 2312966 6. AUTHOR Daria Prosochkina (ERPScan) 7. TECHNICAL DESCRIPTION Attacker can read any file from OS with use BUPA_BIP_FILE_IMPORT program. Filename used in statement READ DATASET (line 428) is entered in this statement by user input. User can pass to input arbitrary filepath, for example /etc/passwd. As a result of execution of the BUPA_BIP_FILE_IMPORT program, data from /etc/passwd will be written in P_FLEN variable in hex format. Vulnerable code 426. p_flen = 0. 427. DO. 428. READ DATASET p_ifilea INTO lw. 429.* Exit conditions for accessing in a loop 430. IF sy-subrc NE 0. EXIT. ENDIF. 431. APPEND lw TO p_itab . 432. 433. p_flen = p_flen + XSTRLEN( lw-d ) . 434. ENDDO. 8. REPORT TIMELINE Sent: 22.04.2016 Reported: 23.04.2016 Vendor response: 23.04.2016 Date of Public Advisory: 09.08.2016 9. REFERENCES https://erpscan.com/advisories/erpscan-16-031-sap-netweaver-abap-directory-traversal-via-using-read-dataset/ # 0day.today [2024-07-01] #